Nikon HB-43 Bayonet Lens Hood
The dedicated Nikon HB-43 Lens Hood is specifically designed for use with the PC-E Micro Nikkor 45mm f/2.8D ED lens.
Lens hoods are primarily designed to prevent unwanted stray light from entering the lens by extending and shading the end of the lens. In addition, since the end of the lens is extended, you also get the added benefit of some extra protection from accidental impact.
The stock listed above does not take into account variances in stock levels that may occur and any items on hold.